While the leadership changes announcement make it sound like Mike Vale is being positioned to take over the reigns after Mike Roman is asked to retire, I believe the BoD will choose an external leader to run the company. The last two 3M-lifers-turned-CEO, Roman and Thulin, have been utter disasters. Buckley (hired from Brunswick), on the other had, actually grew the company (easy to look up 3M revenue during Buckley's tenure from 2005-2011).
3M needs new leadership, and the same old 3M way of thinking needs to change.